[Ovmsdev] CHARGEBY / CHARGEAT timing

Mark Webb-Johnson mark at webb-johnson.net
Fri Oct 18 14:07:38 HKT 2013


Currently, no. If ACC is waiting for a charge, it will stop charges until the designated time. This is a side-effect of it having to stop the car's automatic charge start on plugin.

It could be changed to work that way, but we would have to have a delay (perhaps 1 minute) for ACC to be in control, before it backed off and allowed the user to do their thing.

Regards, Mark.

On 18 Oct, 2013, at 1:50 pm, Tom Saxton <tom at idleloop.com> wrote:

> In the CHARGEAT case, can I manually start the charge and not have the ACC
> code stop it?
> If so, then I think the behavior you describe in both cases is correct.
>   Tom
> On 10/17/13 6:00 PM, "Mark Webb-Johnson" <mark at webb-johnson.net> wrote:
>> I'm seeking people's opinions for the ACC CHARGEBY / CHARGEAT timing
>> behaviour.
>> The problem I have is to decide what algorithm to use for the case that
>> people plugin after the scheduled charge time (or in the case of
>> CHARGEBY, plugging in with a charge predicted to take to long to complete
>> by the scheduled charge time).
>> For example, say I have CHARGEAT set to 19:00:00. I get home, and plugin,
>> at 19:10:00. What should we do? Schedule the charge for 19:00:00 the next
>> day, or charge immediately? The logical choice seems to be charge
>> immediately, but how far do we allow that 'nice' behavior to go?
>> 19:10:00? 20:00:00? 23:00:00? etc?
>> I guess we need some threshold, but what do people think is a sensible
>> value for that threshold?
>> For CHARGEBY, it is slightly more complicated. Say I plugin at 18:00:00,
>> with a CHARGEBY of 21:00:00, but the prediction says 4 hours is required?
>> What to do? What if, for the same case, I plugin at 22:00:00?
>> The current algorithm in ACC does not allow any safety threshold. If
>> CHARGEAT is 19:00:00 and you plugin at 19:01:00, tough luck - the charge
>> will start at 19:00:00 tomorrow. For CHARGEBY, we do check if there is
>> enough time to complete the charge before the scheduled time in the same
>> day - if not, we send a charge alert message and start charging
>> immediately.
>> What do people think? Remember that this is a small embedded processor
>> without much ram/flash, so we need to keep things simple.
>> Regards, Mark.
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